gpio: pca953x: Fully convert to device managed resources

Curtrently the error path is unsynchronised with removal due to
regulator being disabled before other device managed resources
are handled. Correct that by wrapping regulator enablement in
the respective call.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>